The main difference lies in the design and features: The Bosch Unlimited 7 ProHygienic Aqua (BKS71HYG1) is a bagless upright hoover with an integrated suction and wiping function, an articulated suction tube, HEPA filter, 3 suction levels, a 300 ml dust container and a weight of 5.3 kg. It offers a running time of up to 40 minutes and has a noise level of 82 dB. The scope of delivery includes various nozzles and a charging station for wall mounting.

In comparison, the other model is a stick hoover with 23.5 W power consumption, battery operation, 40 minutes battery runtime, a weight of 2.9 kg and a noise emission of 82 dB. It has simpler features, without a wiping function or articulated tube, and has no information on dust bin size or accessories [product data].

Summarised:

- Bosch Unlimited 7 ProHygienic Aqua (BKS71HYG1): Combination appliance with vacuuming and mopping, kinkable tube, HEPA filter, 3 suction levels, 300 ml container, 5.3 kg, extensive accessories, wall bracket.

- Other model: Lighter stick hoover, 23.5 W, 40 min running time, 2.9 kg, no mopping function, fewer accessories.

The ProHygienic Aqua is therefore a more versatile and heavier appliance with more functions and accessories.